Design of cochlear nerve implant based on the tonotopic organization of the cochlear nerve

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In order to propose the ideal design of auditory nerve implant based on the physiological frequency structure of the cochlear nerve, the following three investigations were executed; i.e., (1)physiological examination on the tonotopic organization of the cochlear nerve, (2) morphological study of cochlear nerve, (3)electrophysiological examinations on the electrically evoked auditory responses using the fine bipolar stimulation. Based on the present these investigations, the wrap-like electrode wraps around the cochlear nerve with the short needle insertion electrodes were proposed as a possible design of an electrode for auditory nerve implant.